High-density heat storage molded body having porous structure stable in heat storage and release cycle, and method for manufacturing same

Abstract

The present disclosure relates to a method for manufacturing a high-density heat storage molded body having a porous structure stable in a heat storage and release cycle, more particularly, to a method for manufacturing a molded body that is stable in a heat storage and release cycle, which includes steps of: preparing ceramic powder; mixing ceramic fibers with the ceramic powder; pressing and molding a mixed powder; and manufacturing the manufactured molded body in the form of a porous molded body by high-temperature heat treatment.

1 . As a molded body that is stable in a heat storage and release cycle by adding ceramic fibers, a thermochemical heat storage molded body comprising:
 ceramic powder; and   ceramic fibers mixed with the ceramic powder.   
     
     
         2 . The thermochemical heat storage molded body of  claim 1 , wherein
 the ceramic powder mixed with ceramic fibers is subjected to pressure molding and high-temperature heat treatment to form a porous molded body shape.   
     
     
         3 . The thermochemical heat storage molded body of  claim 2 , wherein
 the ceramic fiber is at least one of an SiC fiber, an Al 2 O 3  fiber and a ZrO 2  fiber, and   the ceramic powder is at least one of a powder of a char state including an organic compound, a MgO powder, and a CaO powder.   
     
     
         4 . As a method for manufacturing a molded body that is stable in a heat storage and release cycle by adding ceramic fibers, a method for manufacturing a thermochemical heat storage molded body comprising steps of:
 preparing ceramic powder;   mixing ceramic fibers with the ceramic powder;   pressing and molding a mixed powder; and   manufacturing the manufactured molded body in the form of a porous molded body by high-temperature heat treatment.   
     
     
         5 . The method for manufacturing a thermochemical heat storage molded body of  claim 4 , wherein
 in the step of preparing the ceramic power,   a ceramic powder synthesized by a wet process or a commercially available powder is prepared.   
     
     
         6 . The method for manufacturing a thermochemical heat storage molded body of  claim 5 , wherein
 the wet process is at least one of a Pechini method, a sol-gel method and a Colloidal process.   
     
     
         7 . The method for manufacturing a thermochemical heat storage molded body of  claim 5 , wherein
 in the step of mixing ceramic fibers with the ceramic powder, in the case of the commercially available powder, a pore-forming agent is added to form a porous structure.   
     
     
         8 . The method for manufacturing a thermochemical heat storage molded body of  claim 5 , wherein
 the ceramic fiber is at least one of an SiC fiber, an Al 2 O 3  fiber and a ZrO 2  fiber, and   in the step of mixing ceramic fibers with the ceramic powder, in the case of the powder synthesized by a wet process, the powder in a char state including an organic compound is mixed with the ceramic fibers.   
     
     
         9 . The method for manufacturing a thermochemical heat storage molded body of  claim 8 , wherein
 in the step of mixing ceramic fibers with the ceramic powder, a mass ratio of the added ceramic fibers is in a range of 0.5˜5% with respect to the char powder.   
     
     
         10 . The method for manufacturing a thermochemical heat storage molded body of  claim 4 , wherein
 in the step of pressing and molding a mixed powder, the mixed powder is placed into a mold to be pressed and molded, and   the surface area of the molded body is determined by the surface area of the mold, and the thickness thereof is determined according to the amount of the powder.   
     
     
         11 . The method for manufacturing a thermochemical heat storage molded body of  claim 6 , wherein
 the ceramic powder is at least one of a MgO powder and a CaO powder, and   for MgO powder preparation via the Pechini method, magnesium nitrate is dissolved in distilled water, citric acid is added to facilitate synthesis of a solution to which nitrate is added, and ammonium hydroxide is used to adjust the pH to a proper level.   
     
     
         12 . The method for manufacturing a thermochemical heat storage molded body of  claim 8 , wherein
 in the step of manufacturing a porous molded body by heat treating the manufactured molded body at high temperatures, organic residues included in char are removed to form pores during the heat treatment.   
     
     
         13 . The method for manufacturing a thermochemical heat storage molded body of  claim 12 , wherein
 the manufactured porous molded body has a porosity of 30˜70%.   
     
     
         14 . The method for manufacturing a thermochemical heat storage molded body of  claim 4 , wherein
 the step of heat treating the manufactured molded body, the manufactured molded body at high temperatures is performed in air at 800° C. to 1300° C. for 2 to 5 hours.